package com.qf.utils;

/**
 * projectName:day11_booksystem
 * author:liuXin
 * time:2022/6/11 14:51
 * description:字符串的工具类
 */
public class StringUtil {
    public static boolean isEmpty(String str){
        return str==null||str.trim().length()==0?true:false;
    }
}
